Lewis Hamilton's engine has been given the all clear by the FIA following its routine examination prior to the Hungarian Grand Prix.
As autosport.com reported last week, the FIA has begun a series of random tests of the power-units of the car manufacturers in F1 to ensure they are complying with the freeze on development.
Mercedes-Benz were the first manufacturer whose engine was picked to be examined, with Lewis Hamilton's race-winning unit from the German Grand Prix sealed after the race for a detailed examination by the FIA.
The sport's governing body duly conducted an exhaustive test of the engine and its parts, as well as comparing it with the engine that was submitted to the FIA by Mercedes-Benz's High Performance Engines division earlier this year.
The FIA confirmed in Hungary on Thursday that all parts of the engine conformed with the regulations, and there was no disparity between the power unit submitted before the season and the one being used now.